Silo.



No. 694,377; v Pate nted Mar. 4, I902.

a. H. GBEENFIELD.

SILO.

(Application filed septa. 30. 1901.) "N 0 M o d e I.)

Ghee/7 lld Witnesses v )9 j v attozwup UNITED STATES PATENT OFFICE.

GEORGE H GREENFIELD, OF MORAVIA, NEW YORK.

SILO.

SPECIFICATION forming part of Letters Patent No. 694,377, dated March 4, 1902.

Application filed September 30,1901. Serial No. 77,067. (No model.)

- enable others skilled in the art to which it appertains to make and use the same.

This invention relates to silos for storing ensilage; and it has for its object to provide a device of this nature which will be simple and cheap of construction, which will effectually prevent freezing of the contents, and which will be unaffected in its structure by changes in temperature, the seams being at all times closed against ingress or egress of heat. Other objects and advantages of the invention will be understood from the following description. 7

In the drawings forming a portion of this specification, and in which like numerals of reference indicate similar parts in the several views, Figure l is a perspective view showing the silo, a portion of the outer wall thereof being broken away to more clearly show the structure. Fig. 2 is a transverse section through the silo.

Referring now to the drawings, there is shown a silo comprising an inner shell 5 and an outer shell 6, between which are disposed the sustaining-hoops 7.

In the construction of the silo a false structure is provided, comprising uprights and connecting cross-pieces, and tothe outer faces of these uprights are secured the hoops 7, each of which consists of a plurality of layers or laminals of wood securely nailed'together to give the greatest strength and rigidity. After the hoops have been properly spaced and disposed parallel the outer shell 6 is nailed to the outer faces or peripheries of the hoops, the shell consisting of planks which are disposed edge to edge in close relation and which extend from the top hoop to below the bottom hoop, the lower ends of the planks being securely nailed to the base or bottom 9 of the silo. These planks are preferably tongue-and-grooved to prevent air-currents. After the outer shell has been put into place and the inner shell, consisting of tongue-andgrooved planks, m utuallyengaged, are nailed against the inner faces of the hoops and extending from the top to the bottom of the silo the false structure is removed through the top of the silo and planks are nailed against the inner faces of the hoops in the places formerly occupied by the uprights of the false structure. There is thus formed the inner and outer shells 5 and 6, held in proper spaced relation and rigidly by the hoops 7, and between each pair of hoops and the shells is an annular air-space 10, which, being completely inclosed, serves to retard both radiation and absorption by the contents of the silo.

In the inner and outer shells of the silo are door-openings, in which are disposed doors 11 and 12, respectively, provided with hinges to facilitate opening and closing and having also latches in the form of turnbucklcs. The turn-buttons 14c are pivoted upon, the outer face of the outer wall to engage the doors 12 and prevent them from swinging outwardly, while the turn-buttons 14 are pivoted to the outer faces of the inner doors to engage the inner wall and prevent the doors from swinging inwardly. The door-openings in which the doors fit are continuous from points near to the top to points near to the bottom of the silo, and these openings register, so that by opening an outer door and an inner door directly in the rear thereof, and which registers therewith, access may be had to the silo at a corresponding point of the height thereof.

Upon the upper end of the silo there is disposed the conical roof 15, in one side of which is the dormer-window 16 to give light to the interior of the silo. It will be noted that each door reaches from a line between the upper and lower faces of a hoop to a corresponding line of another hoop, and when closed the doors rest snugly against the hoops, so that when the doors are closed the annular airchambers are sealed. Furthermore, when one inner and corresponding outer door is opened access of outside air is limited to the air spaces or chambers thus opened and not to others. The parts being of wood there is not sufficient expansion and contraction under atmospheric changes to draw the tongues and grooves of the boards apart, and there are in consequence no cracks for ingress or escape of heat. The conical roof terminatesin an an nular opening 20, over which is disposed a conical cap 21, which may be removed to allow escape of air.

registering door-openings,and inner and outer doors for the openings, the inner doors registerin g with the corresponding outer doors, and each door terminating on lines between the upper and lower faces of hoops and adapted to lie sn ugl y thereagainst when closed with their mutually-adjacent edges abutting, each pair of inner and outer doors communicating with one of the air-spaces only.

In testimony whereof I affix my signature in presence of two witnesses.

GEORGE H. GREEN FIELD.

Witnesses:

SMITH L. ROSEGRANS, G. H. GREGG. 

